MGate MB3180/MGate MB3280/MGate MB3480

1, 2, and 4-port standard serial-to-Ethernet Modbus gateways

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Features and Benefits 

  • Convert between Modbus TCP and Modbus RTU/ASCII
  • 1 Ethernet port and 1, 2, or 4 RS-232/422/485 ports
  • 16 simultaneous TCP masters with up to 32 simultaneous requests per master
  • Easy hardware setup and configuration 


The MB3180, MB3280, and MB3480 are standard Modbus gateways that convert between Modbus TCP and Modbus RTU/ASCII protocols. Up to 16 simultaneous Modbus TCP masters are supported, with up to 31 RTU/ASCII slaves per serial port. For RTU/ASCII masters, up to 32 TCP slaves are supported.


Standard Modbus network integrationMoxa protocol converter gateway

The three standard MGate™ models (MB3180, MB3280, and MB3480) are designed for easy integration of Modbus TCP and RTU/ASCII networks. With these models, Modbus serial slave devices can be seamlessly incorporated into an existing Modbus TCP network, and Modbus TCP slaves can be made accessible to serial masters. The MB3180, MB3280, and MB3480 offer features that make network integration easy, customizable, and compatible with almost any Modbus network.


High density, cost effective gateway

The MGate™ MB3000 gateways can effectively connect a high density of Modbus nodes to the same network. The MB3280 can manage up to 62 serial slave nodes, and the MB3480 can manage up to 124  serial slave nodes. Each RS-232/422/485 serial port can be configured individually for Modbus RTU or Modbus ASCII operation and for different baudrates, allowing both types of networks to be integrated with Modbus TCP through one Modbus gateway.


Ethernet Interface
Protocols Modbus TCP
Number of Ports 1
Speed 10/100 Mbps, Auto MDI/MDIX
Connector 8-pin RJ45
Magnetic Isolation Protection 1.5 kV (built-in)
Serial Interface
Protocol Modbus RTU/ASCII Slave/Master
Number of Ports MB3180: 1
MB3280: 2
MB3480: 4
Serial Standards RS-232/422/485, software selectable
Connectors DB9 male
ESD Protection 15 kV for all signals
RS-485 Data Direction Control ADDC® (automatic data direction control)
Serial Communication Parameters
Data Bits 7, 8
Stop Bits 1, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, DTR/DSR, RTS Toggle (RS-232 only)
Baudrate 50 bps to 921.6 kbps
Serial Signals
RS-422 Tx+, Tx-, Rx+, Rx-, GND
RS-485-4w Tx+, Tx-, Rx+, Rx-, GND
RS-485-2w Data+, Data-, GND
Configuration Options Web Console, Serial Console, Telnet Console, Windows Utility
Utility MGate Manager for Windows 2000, Windows XP, Server 2003, Vista, Server 2008 (x86/x64), Windows Server 2008 R2, Windows 7/8/8.1 (x86/x64), Windows Server 2012 (x64), Windows 2012 R2
Multi-master and Multi-drop Master mode: 32 TCP slaves
Slave mode: 16 TCP masters (request queue 32-deep for each master)
Support Smart Routing, MXview, SNMP v1 (read only)
Physical Characteristics
Housing Metal, IP30
Weight MGate MB3180: 340 g (0.75 lb)
MGate MB3280: 360 g (0.79 lb)
MGate MB3480: 740 g (1.63 lb)
Dimensions Without ears:
MB3180: 22 x 52 x 80 mm (0.87 x 2.05 x 3.15 in)
MB3280: 22 x 77 x 111 mm (0.87 x 3.03 x 4.37 in)
MB3480: 35.5 x 102.7 x 157.2 mm (1.40 x 4.04 x 6.19 in)
With ears:
MB3180: 22 x 75 x 80 mm (0.87 x 2.95 x 3.15 in)
MB3280: 22 x 100 x 111 mm (0.87 x 3.94 x 4.37 in)
MB3480: 35.5 x 102.7 x 181.3 mm (1.40 x 4.04 x 7.14 in)
Environmental Limits
Operating Temperature 0 to 60°C (32 to 140°F)
Storage Temperature -40 to 85°C (-40 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Power Requirements
Input Voltage 12 to 48 VDC
Input Current MGate M3180: 200 mA @ 12 VDC
MGate M3280: 250 mA @ 12 VDC
MGate M3480: 385 mA @ 12 VDC
Power Connector MGate MB3180: Power jack
MGate MB3280/3480: Power jack and terminal block
Standards and Certifications
Safety UL 60950-1, EN 60950-1
EMC EN 55022/24
EMI CISPR 22, FCC Part 15B Class A
EMS IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
IEC 61000-4-5 Surge: Power: 1 kV (MB3180/MB3280)
IEC 61000-4-5 Surge: Power: 1 kV; Signal: 2 kV (MB3480)
IEC 61000-4-6
MTBF (mean time between failures)
Time MGate M3180: 628,376 hrs
MGate M3280: 503,029 hrs
MGate M3480: 295,812 hrs
Standard Telcordia SR332
Warranty Period 5 years
Details See

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Available Models

  Model No. Description
MGate MB3180 1-port standard Modbus gateway
MGate MB3280 2-port standard Modbus gateway
MGate MB3480 4-port standard Modbus gateway

Optional Accessories

Mounting Kits
  Model No. Description
DK35A DIN-Rail Mounting Kit (35 mm)
  Model No. Description
Mini DB9F-to-TB DB9 Female to Terminal Block connector
Trial Software
  Model No. Description
MXview Industrial network management software designed for converged automation networks